To the left of the unit, there is a little door covering a slot. If you don't have a chip in there, you are on the base map which is virtually useless for navigation. Navionics makes chips in various formats to plug into your unit. But the will make you buy one for inland lakes or west coast, east coast, etc.
the C80 is a great unit, but you have to customize it via the desired chip maps for your cruising area.